A conference server (100), comprising:
an interface (190) communicatively coupled to a plurality of media devices operated by conference participants (30);
a conferencing module (140) operable to manage one or more conference calls by maintaining a conferencing matrix (155) of said conference participants (30) to said conference calls, said conferencing matrix (155) defining a respective output media provided to each of said conference participants (30) based on respective input media received from other ones of said conference participants (30); and
processing circuitry (110) operable to control said conferencing module and coupled to receive said input media from said conference participants (30) via said interface (190) and provide said input media to said conferencing module (140) and coupled to receive said output media from said conferencing module (140) and provide to said output media to said conference Participants (30) via said interface (190), the server characterized by comprising coefficients of said conferencing matrix (155) which are determined based on one or more pre-stored conference policies.